// Copyright 2015 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package pattern

type exactMatch string

func (m exactMatch) Match(s string) bool {
	return string(m) == s
}

func (m exactMatch) String() string {
	return "exact:" + string(m)
}

// Exact returns a pattern that matches s only.
func Exact(s string) Pattern {
	if s == "" {
		return None
	}
	return exactMatch(s)
}
